package com.leyou.item.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;

import com.leyou.item.dto.CategoryDTO;
import com.leyou.item.entity.Category;
import com.leyou.item.entity.CategoryBrand;
import com.leyou.item.mapper.CategoryMapper;
import com.leyou.item.service.CategoryBrandService;
import com.leyou.item.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

/**

 */
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper,Category> implements CategoryService {
    @Autowired
    private CategoryBrandService categoryBrandService;


    @Override
    public List<CategoryDTO> queryCategoryByBrandId(long brandId) {
        //1.根据品牌id,查询中间表,得到中间表对象集合
        List<CategoryBrand> categoryBrandList = categoryBrandService.query().eq("brand_id", brandId).list();
        if (CollectionUtils.isEmpty(categoryBrandList)) {
            return Collections.emptyList();
        }
        //2.获取分类id集合
        List<Long> categoryIdList = categoryBrandList.stream()
                .map(CategoryBrand::getCategoryId)
                .collect(Collectors.toList());
        //3.根据分类id集合,查询分类对象集合
        List<Category> categories = listByIds(categoryIdList);
        //4.转换DTO
        return CategoryDTO.convertEntityList(categories);
    }

    @Override
    public List<CategoryDTO> queryCategoryByIds(List<Long> ids) {
        return CategoryDTO.convertEntityList(listByIds(ids));
    }

    @Override
    public List<CategoryDTO> queryCategoryByPid(Long pid) {
        //select * from tb_category where parent_id = pid
        List<Category> categories = query().eq("parent_id", pid).list();

        List<CategoryDTO> categoryDTOS = CategoryDTO.convertEntityList(categories);
        return categoryDTOS;
    }

    @Override
    public CategoryDTO queryCategoryById(Long id) {
        return new CategoryDTO(this.getById(id));
    }


}
